Process of duplicating type-written work



(IIo Model.)

A. B. DICK.. PROCES/S 0E DUPLIGATING TYPE WRETTEN WGRK. y No. 466,557. Patented Jan. 5, 1892.

m W'kwcooco om @C @m5 the type. l

be vused to print duplicates from inthe man- 5o whereby the inkproof coating is partially re- PATENT OFFICE.

ALBERT B. mcK, OFLCHICAGO, immers.

Pecci-:ss oF 'ouPLieA-rlNe TYPE-wmTi-EN woRK.

, SPECIFICATION forming part of Letters Patent No. 466,557, dated .Jamin-y 5, 1892.

Application filed October 20, '1.890- Serlal No. 368,705'- (Nomodel.)

To all whom it may concern.'

Be it known that I, ALBERT li. DICK, aciti zen of the United States, residing at Chicago, Cook county, Illinois,- have invented la certain new and useful Improved Process of and lllaterials for Duplicating Type-Writer Work, of which the following 'is a specification.

My object is to enable the productionupon any'ordinary type-writingmaehine of a stencil from which a. large number of copies can be printed, which copies will accurate] v resemble ordinary type-written mattei'.

lleretofore it has been proposed t'o provide the type with performing-points whichwould formsmall' holesl in the stencil-sheet, representing the outlines of the types; but this method of preparing a type-writer stencil would require a special construction of typewriter not adapt-ed for ordinary type-writing, and the stencil produced by such method would -not give a copy resembling original type-writin g.' I have found that by the employment of asheet of -th'in and-porous paper, such as J apanes paper of that kind known as dental paper7 or yoshino,coated with asubstance impervious to'ink, such as paratline, and a`covering-sheet on either'or on each side of said coated sheet, preferably of a fine mesh fabric, the striking ofthe type causes the coating to be forced into or received into or onto the covering -shect, or where a covering-sheet is employed on each side oi the coated sheet, a portion of the coating is driven onto or into each ofthe covering-sheets, so that when the covering sheet or sheets are removed from the coated sheet the coating will be removed with it or them on the lines of the type, and theV coated sheet is then f a stencil-sheet with the fibers of its paper left exposed' and unbroken where struekhy '.lhis stencil so produced can then ner well understood, its surface being inkproof, so that ink will not pass through to effeet printing except where struck by the type.

The present invention relates to a process of forming the stencil wherein a coveringsheet is used on each side of the stencil-sheet during the operation of forming a stencil,

moved by cach 'covering-sheet on the lines lhaving preferably a fine mesh.

struck bythe type. l 'lhe process wherein but a single covering-sheet is employed on either side of the 'stencil is claimed in an application, Serial Nok252,003, filed by me October 11', 18S?. The sheet to be used as the stencilplate is made of thin paraliine or other suitably-waxed paper, whichcan be of. any desired dimensions suitable for running through an ordinal' type-writer. Preferably the paper employed as the retaining-body of the-v stencil-sheet is a Japan'esepaper of the kind known as dental paper or yoshno,

though anyother materialof suitable strength, thinness, and' porosity may be used. .'lhe` coating to be employed thereon is one whichv is soft enough to permit of its being driven into erento the covering sheet or sheets and .being removed from the stencil-sheet thereon'l The covering-sheet employed' by me is prefably a fine sheet of thin line fabric, such as silk, bolting-cloth, or other suitable material A sheet of tissue-paper of any open porous structure presents Ta surface having a fine mesh and' may be employed successfully as a coveringsheet, whereon a portion of the ink-proof coating may be-removed from the stencil-sheet. Preferably when tissue-paper is employed as `a covering-sheet I employ it in front of the stencil-plate, as it will receive the face of the type and prevent any inl: therefrom from being transferred to the stencil-paper, and can after one use be thrown away. vWitha sheet of tissue-paper employed as the-front covering of the stencil-plate I prefer to employ as the back covering, so far as the process herein recited is concerned, a'sheetof paper or other material that will present a firm and solid backing for the stencil-plate and front covering-sheet. These three sheets-to wit,

the stencil-plate, front covering, and backing or bac-k covering, the coverings both being of a nature to receive the coatingof the stencil-plate and all being of a size to be run through a typewriter-are introduced therein, the ink-ribbon being first removed and the machine operated in the ordinary manner, when' it will be found that the face ofthe type will be produced on the stencil-plate without removing the' coating therefrom, except to the extent of the type-surface, by rea- IOO son of the action of the covering-sheets', by which the coatingis removed only where the type strike, leaving on the stencil-paper au exact reproduction of the type-face, as before described. An examination of the covcling-sheets will show that a portion of the coating Yet the stencil-plate has adhered to and been carried ot by each of them, the

larger portion of the coating probably being found on the back covering-sheet. Y

The stencil-plate prepared as above stated, by the use of a covering-sheet on each side thereof, can be laid overa sheet of letter or other paper and an inkng-rollcr run thereon, transferring to the letter or other paper the matter on the stencil-plate, and it will be seen that the matter thus reproduced will be in form and arrangement a duplicate of the work produced by the type-writer in all respects as to the character of theletters and the lines of printing.

In the accompanying drawing, forming a part of this specification, the single 4figure represents the stencil-sheet and its coverings.

being tiret removed and the machine oper- 35 ated in the ordinary manner, when it will be found that the face of the type' will be. pro# duced on the stencil-plate without removing the coating therefrom, except to the extent of the type-surface, by reason of the action 4o ot' the coveringsheets, by -which the coating is removed oi1ly' where the type strikes, 1eaving on the stencil-paper the exact reproduction et the type-face, as before described.

The process of preparing a stencil for-duplicatingeopies,consistinginintrodncinginto a type-writing machine a sheet of porousma t'erial coated with an Vink-prooi` substance, a sheet of 'paper arranged in the rear thereof, 5o and a sheet of tiSsue-paperarranged in front thereof, to both of which papeneheets-the i nlc-proof substance will adhere, then impressing the superimposed sheets with the matter` to be copied, thereby causing the ink- 55 proof lsubstance of the coated sheet toadhere to the surface of the otherv sheets on the lines of im pression, and then separating the sheets, thereby removing the coating from the inkproo sheet on the lines of the type-impres 6o sion, substantially asset forth.

This specification lsigned and witnessed thisy 18th day of October, 1390.

ALBERT B.V DICK,

Witnesses:

Dr H. DRISCOLL, K. I. DnisCoLL. 

